[ttml2] Pull Request: Fix derivation for 'tts:displayAlign' (#976).

skynavga has just submitted a new pull request for https://github.com/w3c/ttml2:

== Fix derivation for 'tts:displayAlign' (#976). ==
Closes #976.

See https://github.com/w3c/ttml2/pull/997

Received on Monday, 10 September 2018 16:19:17 UTC